/*
 * Copyright (C) 2008 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.gson;

/**
 * A class representing a Json {@code null} value.
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 * @since 1.2
 */
public final class JsonNull extends JsonElement {
    /**
     * singleton for JsonNull
     *
     * @since 1.8
     */
    public static final JsonNull INSTANCE = new JsonNull();

    /**
     * Creates a new JsonNull object.
     * Deprecated since Gson version 1.8. Use {@link #INSTANCE} instead
     */
    @Deprecated
    public JsonNull() {
        // Do nothing
    }

    @Override
    JsonNull deepCopy() {
        return INSTANCE;
    }

    /**
     * All instances of JsonNull have the same hash code since they are indistinguishable
     */
    @Override
    public int hashCode() {
        return JsonNull.class.hashCode();
    }

    /**
     * All instances of JsonNull are the same
     */
    @Override
    public boolean equals(Object other) {
        return this == other || other instanceof JsonNull;
    }
}
